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基于功角保持的 VSG 低电压穿越控制策略

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VSG low voltage ride through control strategy based on power angle maintenance

期刊信息

合肥工业大学（自然科学版），2024年5月，第47卷第5期：612-619，634

DOI: 10.3969/j.issn.1003-5060.2024.05.006

作者信息

杜 燕，蒋 伟，杨向真，苏建徽

（合肥工业大学电气与自动化工程学院，安徽 合肥 230009）

摘要和关键词

摘要: 虚拟同步发电机(virtual synchronous generator, VSG)控制通过模拟同步发电机的运行特性,达到并网逆变器为电网提供惯性支撑的目的。传统 VSG 在电网发生短路故障时容易导致输出电流越幅与功角振荡,无法为电网提供无功支撑,使逆变器不具备低电压穿越能力。文章提出一种 VSG 低电压穿越控制策略,故障期间保持功角稳定,故障恢复期间通过基于虚拟功率的功角保持环节实现预并列,故障恢复后输出功率能够快速恢复至给定值,运行模式之间能够平滑快速切换,实现低电压穿越。仿真验证了该控制策略的正确性与有效性。

关键词: 虚拟同步发电机（VSG）；低电压穿越；功角保持；动态响应

Authors

DU Yan, JIANG Wei, YANG Xiangzhen, SU Jianhui

(School of Electrical Engineering and Automation, Hefei University of Technology, Hefei 230009, China)

Abstract and Keywords

Abstract: Virtual synchronous generator(VSG) control simulates the operation characteristics of the synchronous generator to achieve the purpose of providing inertia support for the power grid by grid-connected inverter. The traditional VSG is easy to cause the over-amplitude of the output current and the power angle oscillation when a short-circuit fault occurs in the power grid, and it cannot provide reactive power support for the power grid, so that the inverter does not have the ability of low voltage ride through(LVRT). Aiming at this problem, this paper puts forward a kind of LVRT strategy based on VSG control. The power angle keeps stable during the fault, the pre-synchronization is implemented through a link of power angle maintenance based on virtual power during the fault recovery, and after the fault is recovered, the output power can be quickly restored to the given value to realize the smooth and quick switching between operating modes, thus achieving the LVRT. Simulation results show that the control strategy is correct and effective.

Keywords: virtual synchronous generator(VSG); low voltage ride through(LVRT); power angle maintenance; dynamic response

基金信息

国家重点研发计划资助项目（2018YFB0904100）

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